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• W2047436557 startingPage "477" @default.
• W2047436557 abstract "Tetraspanins (or proteins from the transmembrane 4 superfamily, TM4SF) form membrane complexes with integrin receptors and are implicated in integrin-mediated cell migration. Here we characterized cellular localization, structural composition, and signaling properties of alpha3beta1-TM4SF adhesion complexes. Double-immunofluorescence staining showed that various TM4SF proteins, including CD9, CD63, CD81, CD82, and CD151 are colocalized within dot-like structures that are particularly abundant at the cell periphery. Differential extraction in conjunction with chemical cross-linking indicated that the cell surface fraction of alpha3beta1-TM4SF protein complexes may not be directly linked to the cytoskeleton. However, in cells treated with cytochalasin B alpha3beta1-TM4SF protein complexes are relocated into intracellular vesicles suggesting that actin cytoskeleton plays an important role in the distribution of tetraspanins into adhesion structures. Talin and MARCKS are partially codistributed with TM4SF proteins, whereas vinculin is not detected within the tetraspanin-containing adhesion structures. Attachment of serum-starved cells to the immobilized anti-TM4SF mAbs induced dephosphorylation of focal adhesion kinase (FAK). On the other hand, clustering of tetraspanins in cells attached to collagen enhanced tyrosine phosphorylation of FAK. Furthermore, ectopic expression of CD9 in fibrosarcoma cells affected adhesion-induced tyrosine phosphorylation of FAK, that correlated with the reorganization of the cortical actin cytoskeleton. These results show that tetraspanins can modulate integrin signaling, and point to a mechanism by which TM4SF proteins regulate cell motility." @default.
• W2047436557 created "2016-06-24" @default.
• W2047436557 creator A5007448463 @default.
• W2047436557 creator A5009950823 @default.
• W2047436557 date "1999-07-26" @default.
• W2047436557 modified "2023-10-16" @default.
• W2047436557 title "Characterization of Integrin–Tetraspanin Adhesion Complexes" @default.
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• W2047436557 doi "https://doi.org/10.1083/jcb.146.2.477" @default.
• W2047436557 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2156181" @default.
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